Question

Which one of the following is wrongly matched?

• A. Transcription - Writing information from DNA to m-RNA.
• B. Translation - Using information in m-RNA to make protein.
• C. Repressor protein - Binds to operator to stop enzyme synthesis.
• D. Operon - Structural genes, operator and promoter.

Answer 1

Answer: (A)

Transcription is the process of copying genetic information from one strand of the DNA into mRNA, not tRNA. The translation is the process of translating the sequence of a messenger RNA (mRNA) molecule to a sequence of amino acids during protein synthesis. The regulator gene in the operon produces repressor protein that binds to the operator region to stop the operon, which in turn stops the synthesis of enzymes. A typical operon consists of a group of structural genes that code for enzymes involved in a metabolic pathway along with a single operator and promoter.